Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02495509 2005-O1-31
Improved finger type seed meter back plate seeding device
BACKGROUND OF THE INVENTION
Field of the invention
The invention relates generally to seeding apparatus but more particularly to
an
improved back plate fitted on a finger type seed meter.
Background of the invention
When planting com and other row crops, it is essential to place the seeds in
the
ground with uniform spacing between the seeds to ensure an even growth and
maximum crop yield. To do so, a number of inventions have tackled the problem,
at
this point, the most practical method found is to use a disk rotating in a
vertical plane
which pushes seeds out through a small hole from where the seeds fall into the
soil.
Over the years, other inventors have added improvements such as having
improved
seating for individual seeds in seed cells on the periphery of the seed disc
as the
seed disc rotates through the seed reservoir. Improvements also include a
barrier
brush for preventing seeds from entering the delivery tube directly from the
reservoir,
and a brush holder which limits the effective width of a peripheral retainer
brush so
that the retainer brush cannot retain two seeds simultaneously in the same
seed cell.
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Another invention boasts an axial inner wall, a radial outer wall and a
flexible radial
inner wall wherein singled seeds are trapped in a seed trapping area. A
flexible and
resilient insert together with an axially extending brush removes excess seeds
from
the seed receiving cells as they pass through the seed puddle before entering
the
seed trapping area.
Another invention has a backing plate having a cutout section and a plurality
of
variable inserts to get accurate seed spacing of a variety of size and shapes
of seeds.
Each insert of the meter includes a seed release area having varied shapes and
depths of projections and depressions to accomplish accurate and timely
release from
the fingers of seeds of various sizes and shapes. The exit void being varied
both in
dimension and contour to substantially eliminate seed rejections and to ensure
seed
ejection into a seed tube.
Each type of seeds having speck shapes and sizes, it is difFcult to fnd a
single
planter which will work perfectly for each type of seeds and one has to
constantly
change the finger wheel or the back plate or bath in order to reduce to a
minimum
rebound or jamming which makes the seeds skip the normal evenly spaced row
seeding.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages inherent in the known devices now
present in
the prior art, the present invention, which will be described subsequently in
greater
detail, is to provide objects and advantages which are:
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To change the orientation of seeds along their sides so that they present a
more
uniform profile for improved grasping.
To provide a funneling means to reorient the seeds along their lengths to
further
improve grasping.
To attain these ends, the present invention generally comprises a mod~ed back
plate
wall having a circumferential groove on over half of the inner perimeter. This
groove
helps in improving the way seeds are presented to fingers and ultimately the
exit hole.
It reduces the incidence of Jamming of seeds or of seeds being missed by the
fingers
which take seeds to the exit hole. This groove has three main variations to
accomodate various sizes and shapes of seeds: A groove with and added side
bump
which rotates flat seeds so that their flat side is parallel to the bottom of
the groove, a
groove with a narrowing which funnels the seeds .for a batter grasping by the
fingers,
and a groove with a combination side bump and narrowing.
There has thus been outlined, rather broadly, the more important features of
the
invention in order that the detailed description thereof that follows may be
better
understood, and in order that the present contribution to the art may be
better
appreciated. There are additional features of the invention that will be
described
hereinafter and which will form the subject matter of the claims appended
hereto.
In this respect, before explaining at least one embodiment of the invention in
detail, it
is to be understood that the invention is not limited in its application to
the details of
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construction and to the arrangements of the components set forth in the
following
description or illustrated in the drawings. The invention is capable of other
embodiments and of being practiced and carried out in various ways. Also, it
is to be
understood that the phraseology and terminology employed herein are for the
purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon
which this
disclosure is based, may readily be utilized as a basis for the designing of
other
structures, methods and systems for carrying out the several purposes of the
present
invention. It is important, therefore, that the claims be regarded as
including such
equivalent constructions insofar as they do not depart from the spirit and
scope of the
present invention.
These together with other objects of the invention, along with the various
features of
novelty which characterize the invention, are pointed out with particularity
in the
claims annexed to and forming a part of this disclosure. For a better
understanding of
the invention, its operating advantages and the specific objects attained by
its uses,
reference should be had to the accompanying drawings and descriptive matter in
which there is illustrated preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT
Fig.1 Exploded orthogonal view of a back plate and finger wheel of the prior
art.
Fig. 2 Orthogonal view of a back plate with a groove.
Fig. 3ab Front views of a finger of the prior art and of this invention
respectively.
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Fig. 4 Top view of a second variation of the groove with the side bump
Fig. 5 Top view of a third variation of the groove with both the side bump and
narrowing.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In Fig.1, the prior art teaches the use of back plates (10') set vertically
over a seeding
machines (not shown), having an exit hole (22'} for seeds, a combination bumps
and
depressed part (12'), a wall (14'), and a daisy wheel arrangement of fingers
(18'). This
instant invention also has a back plate (10) configured, sized, and oriented
vertically
to fit over an existing seeding machine, and a combination bumps and depressed
part
(12) situated on a wall (14) of the back plate (10), but with an added
circumferential
groove (16) which traces a path on the wall (14). This groove (18) helps in
reorienting
the seeds that are presented to fingers (18) and ultimately the exit hole
(22). The
circumferential groove (16) can be machined into the wall (14) or moulded, or
stamped during the manufacturing process of the back plate (10). Although not
essential for all types of grain, it is recommended that the circumferential
groove (18)
not present a sharp edge but rather rounded softened edges (20) so as to
reduce the
tendency of grain to get snagged over an otherwise sharp edge. Since the
circumferential groove (16) changes the dynamics of the moving seeds, it is
preferable to use new shorter fingers (18} as per Fig: 3b, otherwise identical
to the
fingers of the prior art (1 B'), as per Fig. 3a, in that they rotate against
the back plate
(10). The combination bumps and depressed part (12) is of course configured so
as
to accomodate the groove (i6) and shorter fingers (18). The width of the
groove (18)
and the contour of the combination bumps and depressed part (12) are
configured as
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an ensemble optimized for certain types of seeds. Thus there may exist a
variety of
back plates (10), each having a circumferential groove (1~) and a combination
bumps
depressed part (12) being configured and sized appropriately for the seeds
being
used. Also the length of the fingers (18) although they remain usually shorter
than the
fingers (18') of the prior art. Since farmers specialize in certain types of
crops, only
one type of back plate (10) may be required by a farmer.
To further acxomodate the various sizes and shapes of seeds, the
circumferential
groove (16) has a number of possible variations including that shown in Fig. 4
wherein the circumferential groove (18') is set at hte outside periphery of
the wall (14)
has a narrower section (24) which leads to the bump and depressed part (12).
This
narrower section has been found to improve the picking up of the grain by the
fingers
(18) since the grain is pushed against the side (15) of the back plate (10)
and is
forced to be picked by the fingers (18).
Fig. 6 shows the same circumferential groove (16) with a narrower section (24)
but
with the addition of a side bump (26) upon which interacts the wide side of a
seed.
Upon hitting the side bump (26), a seed will turn sideways so that its flat
side is
parallel to the bottom of the circumferential groove (16'). !t is of course
possible to
have a groove (16) as per Fig. 2 that has a narrower section (24) which would
favor
yet another type of seeds.
As to a further discussion of the manner of usage and operation of the present
invention, the same should be apparent from the above description.
Accordingly, no
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further discussion relating to the manner of usage and operation will be
provided.
With respect to the above description then, it is to be realized that the
optimum
dimensional relationships for the parts of the invention, to include
variations in size,
materials, shape, form, function and manner of operation, assembly and use,
are
deemed readily apparent and obvious to one skilled in the art, and all
equivalent
relationships to those illustrated in the drawings and described in the
specification are
intended to be encompassed by the present invention.
Therefore, the foregoing is considered as illustrative only of the principles
of the
invention. Further, since numerous modifications and changes will readily
occur to
those skilled in the art, it is not desired to limit the invention to the
exact construction
and operation shown and described, and accordingly, all suitable mod~cations
and
equivalents may be resorted to, falling within the scope of the invention. For
example,
a circumferential groove (16) being the key element, whether there is a
narrower
section (24) or not or the presence or not of a side bump (26) in the
circumferential
groove (16) still makes it still the circumferential groove (1t3), and the
same applies
whether it is set a the outer periphery of the wall (14) or not.
